Process for preparing acrylic polymers in suspension

• US 5,344,901 A
• Filed: 09/15/1993
• Issued: 09/06/1994
• Est. Priority Date: 05/18/1990
• Status: Expired due to Fees

• Current Assignee: Atochem Industriale SRL
• Original Assignee: Atochem Industriale SRL
• Inventors: Anfossi, Nicola, Relvini, Pasquale
• Primary Examiner(s): Schofer, Joseph L.
• Assistant Examiner(s): Sarofin, N.
• Application Number:
  US08/120,870
• Time in Patent Office: 356 Days
• Field of Search: 526/287, 526/201
• US Class Current: 526/201
• CPC Class Codes: C08F 2/20 with the aid of macromolecular dispersing agents
• CPC Class Codes: C08F 20/12 of monohydric alcohols or phenols

Abstract

The present invention relates to a process for preparing acrylic polymers by means of aqueous suspension polymerization in the presence of 0.05-1% by weight, calculated on the suspension, of a stabilizer consisting of a polymer prepared by polymerization of: 60-100% by weight of a salt of a sulphoacrylamide of general formula: ##STR1## 0-40% by weight of at least an acrylic monomer.

Claims

1. A process for preparing acrylic polymers comprising aqueous-suspension polymerization carried out in the presence of 0.05-1% by weight, calculated on the suspension, of a stabilizer consisting of a polymer prepared by polymerizing:

60-100% by weight of a salt of a sulphoacrylamide of formula;

##STR3## where R₁ represents a hydrogen atom or a --CH₃ group, R₂ and R₃, like or different from each other, represent a hydrogen atom or an alkyl C₁ -C₄ radical and M represent an alkaline or alkaline-earth metal; and

0-40% by weight of at least an acrylic monomer.

2. The process according to claim 1, wherein the stabilizer consists of a polymer obtained by polymerizing:

70-90% by weight of monomer (I); and

10-30% by weight of acrylic monomer.

3. The process according to claim 1, wherein the stabilizer, diluted in water at 5% by weight at 25°

C., provides solutions having a Brookfield viscosity ranging from 0.5 to 10 Pa.s.